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Better diagnostics for dlltool errors.

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When dlltool fails, show the full command that was executed. In
particular, llvm-dlltool is not very helpful, printing a generic usage
message rather than what actually went wrong, so stdout and stderr
aren't of much use when troubleshooting.
This commit is contained in:
James Farrell 2023-06-13 16:16:06 +00:00
parent 4bd4e2ea82
commit c59b82353d
5 changed files with 33 additions and 20 deletions
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3
compiler/rustc_codegen_llvm/messages.ftl
View File

@ -1,7 +1,8 @@
codegen_llvm_copy_bitcode = failed to copy bitcode to object file: {$err}
codegen_llvm_dlltool_fail_import_library =
Dlltool could not create import library: {$stdout}
Dlltool could not create import library with {$dlltool_path} {$dlltool_args}:
{$stdout}
{$stderr}
codegen_llvm_dynamic_linking_with_lto =

41
compiler/rustc_codegen_llvm/src/back/archive.rs
View File

@ -198,25 +198,24 @@ fn create_dll_import_lib(
"arm" => ("arm", "--32"),
_ => panic!("unsupported arch {}", sess.target.arch),
};
let result = std::process::Command::new(&dlltool)
.args([
"-d",
def_file_path.to_str().unwrap(),
"-D",
lib_name,
"-l",
output_path.to_str().unwrap(),
"-m",
dlltool_target_arch,
"-f",
dlltool_target_bitness,
"--no-leading-underscore",
"--temp-prefix",
temp_prefix.to_str().unwrap(),
])
.output();
let mut dlltool_cmd = std::process::Command::new(&dlltool);
dlltool_cmd.args([
"-d",
def_file_path.to_str().unwrap(),
"-D",
lib_name,
"-l",
output_path.to_str().unwrap(),
"-m",
dlltool_target_arch,
"-f",
dlltool_target_bitness,
"--no-leading-underscore",
"--temp-prefix",
temp_prefix.to_str().unwrap(),
]);
match result {
match dlltool_cmd.output() {
Err(e) => {
sess.emit_fatal(ErrorCallingDllTool {
dlltool_path: dlltool.to_string_lossy(),
@ -226,6 +225,12 @@ fn create_dll_import_lib(
// dlltool returns '0' on failure, so check for error output instead.
Ok(output) if !output.stderr.is_empty() => {
sess.emit_fatal(DlltoolFailImportLibrary {
dlltool_path: dlltool.to_string_lossy(),
dlltool_args: dlltool_cmd
.get_args()
.map(|arg| arg.to_string_lossy())
.collect::<Vec<_>>()
.join(" "),
stdout: String::from_utf8_lossy(&output.stdout),
stderr: String::from_utf8_lossy(&output.stderr),
})

2
compiler/rustc_codegen_llvm/src/errors.rs
View File

@ -81,6 +81,8 @@ pub(crate) struct ErrorCallingDllTool<'a> {
#[derive(Diagnostic)]
#[diag(codegen_llvm_dlltool_fail_import_library)]
pub(crate) struct DlltoolFailImportLibrary<'a> {
pub dlltool_path: Cow<'a, str>,
pub dlltool_args: String,
pub stdout: Cow<'a, str>,
pub stderr: Cow<'a, str>,
}

4
tests/ui/rfcs/rfc-2627-raw-dylib/dlltool-failed.rs
View File

@ -6,6 +6,10 @@
// compile-flags: --crate-type lib --emit link
// normalize-stderr-test: "[^ ']*/dlltool.exe" -> "$$DLLTOOL"
// normalize-stderr-test: "[^ ]*/foo.def" -> "$$DEF_FILE"
// normalize-stderr-test: "[^ ]*/foo.lib" -> "$$LIB_FILE"
// normalize-stderr-test: "-m [^ ]*" -> "$$TARGET_MACHINE"
// normalize-stderr-test: "-f [^ ]*" -> "$$ASM_FLAGS"
// normalize-stderr-test: "--temp-prefix [^ ]*/foo.dll" -> "$$TEMP_PREFIX"
#[link(name = "foo", kind = "raw-dylib")]
extern "C" {
// `@1` is an invalid name to export, as it usually indicates that something

3
tests/ui/rfcs/rfc-2627-raw-dylib/dlltool-failed.stderr
View File

@ -1,4 +1,5 @@
error: Dlltool could not create import library:
error: Dlltool could not create import library with $DLLTOOL -d $DEF_FILE -D foo.dll -l $LIB_FILE $TARGET_MACHINE $ASM_FLAGS --no-leading-underscore $TEMP_PREFIX:
$DLLTOOL: Syntax error in def file $DEF_FILE:1
error: aborting due to previous error